Finally, I found that I misunderstood the question.

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    I have always been thinking this is probably one of the hardest questions... I read a lot of discussion, but only to be more and more confused. Then I realize...

    the difference between nums[i] and nums[j]


    the difference of nums[i] and nums[j]


    the difference among nums[i], nums[i+1], nums[i+2], ..., nums[j]

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